Underrated animes

We have an Overrated Anime thread, so I think we should have a thread dedicated to underrated animes. What animes do not gain the popularity and attention that they deserve, or are even forgotten in the shadows/past?

I would say Noein, Genocyber, Umineko: When They Cry, Nadia: The Secrets of Blue Water, Heroman, Gunbuster! & Diebuster! and Eureka Seven.

Sket Dance and Beelzebub are my favorite shows and they're underated. I wish that these two would get licensed. That way more folks can try the anime series. Then, we have a cool discussion on it for the community.